For them it's fair, because, once again, the artist's work would be nothing without them.
At work, and boss excluded of course, there's three people who are payed more than me, and all three looks like they are working even less than me.
But the fact is that without our marvelous code guru, we wouldn't have such reputation, while without our wizard security admin, we would have been fucked more than once. And you can't exist as commercial entity, nor works efficiently as computer related company, if you don't have a good network/system admin.
Plus, anyway, it's not because you don't see them working, that they don't work their ass out. You don't reach their level of knowledge and skill without being constantly practicing.
The same apply for me. Each time I'm helping someone fix his code make it easier for me to help coworkers fix theirs. And each solution I found for a "how can I do this", help me perfect the
out of the box thinking that is part of the reasons why I'm the fourth most payed.
Oh, of course, the guys who turn my thoughts into reality works more than me. I pass a day coming to an algorithm, and they need a week to turn it into something working efficiently ; then hate my test suit
But so far none looks like it's something unfair. I have skills that they still have to acquire, and they understand that it's where lie the difference between our paycheck.